Don't fear B&G, acnora! It is a great workout and is, by far, my favorite leg and abs workout. If you fear it simply because it is too much for you, start more slowly than doing the whole thing at once. For instance, you can try doing the first round of standing legs (which I think will take you to about 20-25 minutes into the workout and ends with Cathe says 'back to walking lunges'... which is when I want to start yelling at her
) and then either skip to the floor section and/or abs section or straight to the stretch (whichever is best for you).
Maybe you can do that first half of the standing routine a couple/few times, and then you'll feel ready to add that second set of walking lunges. Then in a couple/few more times, you'll want to add the next set of deadlifts. And, eventually, you'll find yourself having gotten through the whole standing leg section AND the best thing is you will have been getting a killer workout along the way. I think of it this way--even if I can only do half of what Cathe is doing, I'm still getting a good workout!
Regarding the floor section, if the stability ball work is too much, skip those until you feel more comfortable and start with the hamstring work on the step. And if leg weights are too much, don't use them. And the same goes for the abs section. Don't use weight if that is too much. You are still going to see great results and build up the endurance so eventually you can add some resistance to the exercise.
Long story short, but I have suffered more than my fair share of physical injuries in my life (mostly non-fitness related) and once I was starting back (after a really bad back injury) with 30 minutes of low/no impact aerobics (which was a far cry from what I was used to with Cathe). I think I would have been pretty depressed at how far my level of fitness had dropped and how much I was going to need to work to get back to my Cathe workouts had this particular video instructor (Charlene Prickett) not said in the workout 'Do what you can because whatever you do is better for you than sitting on the sofa eating a bag of chips', and that's pretty much my motto when it comes to exercise anymore. I do what I can, and while somedays it may not be the whole thing, it sure as heck is better for me than eating a bag of chips! And doing what I could when I was ready to do it eventually got me back to working out with Cathe and doing some of her more challenging workouts.....like B&G. So take your time, know that what you are able to do is all good, and maybe you'll come to love this workout too!
Congratulation on the great weight loss!